The Accuracy of Lower Extremity Alignment in Total Knee Arthroplasty Using Navigation System: Data Analysis of 661 Cases / 대한정형외과학회잡지

ABSTRACT

PURPOSE: We wanted to evaluate the accuracy of the alignment of the lower extremity in 661 cases of total knee arthroplasty (TKA) with using a navigation system. MATERIALS AND METHODS: We evaluated 661 cases (431 patients) that underwent TKA using a navigation system from June 2006 to September 2008. To analyze the mechanical axis, the weight bearing full length lower extremity radiographs were taken preoperatively and the again at3 weeks after the operation. The results from a well- experienced surgeon (423 cases) were compared with those from a less-experienced surgeon (238 cases), and they both used the navigation system. RESULTS: The mean of the mechanical axis was -13.3degrees (range -33.3degrees-10.6degrees) preoperatively, but it was corrected to -2.0degrees (range -14.3degrees-7.5degrees) after TKA using a navigation system. There was no significant difference between the mean of, -1.8degrees (range -13.4degrees-6.8degrees) by a well-experienced surgeon and the mean of, -2.2degrees (range -14.3degrees-7.5degrees) by a less-experienced one. CONCLUSION: According to the radiologic results, the navigation system is beneficial for the accuracy of the mechanical axis in TKA. The navigation system helps a less-experienced surgeon increase the accuracy of the lower extremity alignment.